Posted by Jerry Stuckle on 12/02/07 19:32

Oliver Grätz wrote:
> Jerry Stuckle schrieb:
>> Oliver Grätz wrote:
>>> Ziggy schrieb:
>>>> I want reverse md5 result in original form but I think it's not possible.
>>> If the text is short then there MIGHT be a solution for your paticular
>>> problem. There are MD5 databases that have really large lists of MD5
>>> input/hash pairs indexed by hash values. Google for "md5 reverse". There
>>> is a small chance to find your input if it was just some characters long.
>> Nope. There are a huge number of strings which can generate the same
>> MD5. Which one do you want?
>>
>> Those MD5 databases are only good for duplicating a specific MD5 hash.
>> They can't tell you what the original was.
>
> Ziggy didn't tell us for what application he needed to revert MD5. If it
> was about password restoration, then reverse MD5 lookup databases ARE a
> possible solution. I precisely narrowed the usability of my answer down
> to "short strings" and "a small chance to find _your_ input".
>
> OLLi
>

And I still stand by my statement. They are not valid for finding an
original string. Even a string of 5 characters may have a duplicate
hash. And the longer you get, the more likely you are to have a
duplicate. Or a password of 'ksfjlksahoh3ndskjvcn' just might have the
same hash as 'abc', for instance.

There is no way you can tell what the original text was. But you can
find one or more values which will generate the same has as you have.

--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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